Detection of targets with small Doppler frequencies of linear-frequency modulated continuous wave radars is the main task of this article. The moving target indicator (MTI) is used to reject the fixed targets and high-speed targets through the radar research area. In this work, targets with small Doppler frequencies can be detected perfectly based on the frequency response of a single delay line canceller followed by single delay line integrator. An enhancement of the proposed algorithm is achieved using a filter in the range direction of the range-Doppler processor scheme. The proposed filter is chosen with certain coefficients after the first fast Fourier transform processor in range to enhance the radar performance. The evaluation of the proposed algorithm is achieved at different slow Doppler scenarios of the target and compared with the traditional algorithm which uses only MTI processor. Another aspect that is important for evaluation of the proposed algorithm is the detection performance of the algorithms through the receiver operating characteristic curves. Implementation of the proposed algorithm using FPGA is performed in real time applications and it is found that it meets the simulation results.

中文翻译：

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增强LFMCW雷达小多普勒频率检测

线性调频连续波雷达的小多普勒频率目标的检测是本文的主要任务。移动目标指示器（MTI）用于拒绝通过雷达研究区域的固定目标和高速目标。在这项工作中，基于单个延迟线消除器和单个延迟线积分器的频率响应，可以完美地检测出具有较小多普勒频率的目标。使用滤波器在距离多普勒处理器方案的距离方向上实现了所提出算法的增强。在第一个快速傅立叶变换处理器之后，在一定范围内选择建议的滤波器，以提高雷达性能。该算法的评估是在目标的慢多普勒场景下实现的，并与仅使用MTI处理器的传统算法进行了比较。对于评估所提出的算法很重要的另一个方面是通过接收机工作特性曲线对算法的检测性能。所提出的算法使用FPGA的实现是在实时应用中执行的，发现它符合仿真结果。